• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+, Seat Adjuster Switch | B1420 | 1 | -- | -- |
Driver Seat Front Vertical Motor Down Control | B1336 | 1 | 1 | -- |
Driver Seat Front Vertical Motor Up Control | B1336 | 1 | 1 | -- |
Driver Seat Rear Vertical Motor Down Control | B1336 | 1 | 1 | -- |
Driver Seat Rear Vertical Motor Up Control | B1336 | 1 | 1 | -- |
Driver Seat Horizontal Motor Forward Control | B1336 | 1 | 1 | -- |
Driver Seat Horizontal Motor Rearward Control | B1336 | 1 | 1 | -- |
Driver Seat Recline Motor Forward Control | B1336 | 1 | 1 | -- |
Driver Seat Recline Motor Rearward Control | B1336 | 1 | 1 | -- |
1. Power seat inoperative |
Battery positive voltage is supplied at all times to the memory seat module (MSM) through the battery positive voltage circuit from the PWR SEATS circuit breaker located in the I/P fuse block. This voltage is used to power up the MSM and also to apply power to the seat motors when commanded On. The MSM applies battery voltage and ground to the seat motors through the motor control circuits. During memory recall and manual seat functions, the motor current is monitored through the motor control circuits by the MSM. When an overcurrent condition is detected by the MSM, it will disable the seat motors in order to prevent the internal MSM circuitry from damage. The MSM is grounded through the module ground circuit at G301.
Battery voltage must be between 9-16 volts.
DTC B1336 will set when the MSM detects a short to ground on a motor control circuit for 100 milliseconds or more.
• | The memory seat functions for the affected seat will be disabled. |
• | The MSM will disable manual movements of the affected motor. |
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred. |
The memory seat module is also referred to as the Driver Position Module in certain scan tool menus.
Memory Seats Description and Operation
Control Module References for scan tool information
• | Driver seat front vertical motor |
• | Driver seat rear vertical motor |
• | Driver seat horizontal motor |
• | Driver seat recline motor |
• | Seat horizontal motor forward control terminal N |
• | Seat horizontal motor rearward control terminal S |
• | Seat front vertical motor up control terminal A |
• | Seat front vertical motor down control terminal M |
• | Seat rear vertical motor up control terminal R |
• | Seat rear vertical motor down control terminal P |
• | Seat recline motor forward control terminal F |
• | Seat recline motor rearward control terminal G |
⇒ | If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, test or replace the appropriate seat motor assembly or recline motor. |
• | Seat horizontal motor terminal A and terminal B |
• | Seat front vertical motor terminal C and terminal D |
• | Seat rear vertical motor terminal E and terminal F |
• | Seat recline motor l terminal A and terminal B |
⇒ | If the test lamp remains OFF during either of the commands, test for a short to ground or an open/high resistance on the control circuits. If the circuits test normal, replace the MSM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for MSM replacement, setup, and programming |